The notation small, filled-in circle corresponds to which node?

The notation small, filled-in circle corresponds to which node?

• A. Initial node
• B. Flow final node
• C. Activity final node
• D. Decision node

Answer: (A)

In activity diagrams, the starting point is shown as a solid black circle. This symbol is the initial node, marking where control flow begins. It has no incoming edges and one outgoing edge to the first action or step. A decision node is drawn as a diamond, and end points (flow final or activity final) use different end symbols, so they aren’t represented by this simple filled circle. Therefore, the small, filled-in circle corresponds to the initial node.

In activity diagrams, the starting point is shown as a solid black circle. This symbol is the initial node, marking where control flow begins. It has no incoming edges and one outgoing edge to the first action or step. A decision node is drawn as a diamond, and end points (flow final or activity final) use different end symbols, so they aren’t represented by this simple filled circle. Therefore, the small, filled-in circle corresponds to the initial node.